180 BASIDIOMYOETES. 



milk and cheese. It can produce a feeble alcoholic fermentation 

 in saccharine liquids. Thrush or aphthaB (0. albicans) appears as 

 white spots in the mouths of children. Several similar Oidium- 

 forms are parasites on the skin and hair of human beings, and 

 produce skin diseases, such as scurvy (0. sclwenleinii) and ring- 

 worm (0. tonsurans)i 



3. Mycorhiza. These Fungi, which have been found on the 

 roots of many trees and heath-plants, particularly Cupuliferse and 

 Ericacea?, consist of septate hyphse, and belong partly to the 

 Hymenomycetes, partly to the Gasteromycetes. It has been 

 shown that the Mycorhiza enters into a symbiotic relationship 

 with the roots of higher plants. 



